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The purpose of SMTP server

Posted on 2013-11-18
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The purpose of SMTP server

in our company , we have 2 Mailbox servers Members of a DAG
2 other servers are CAS/HUB roles on each server.

in the topology(diagram) , they have an SMTP server, I believe it is installed within Load balancer (I could be wrong), but I can ping the smtp server from within the network ex: ping smtp1.domain.com... I am sure it is not a windows box...because I tried the command Systeminfo /s smtp1.domain.com... it did know the system.

Our Scanning box for email Spam and email viruses is hosted online by Micrsoft TMG.

So, my Question is why would they have an SMTP server (it can be an appliance or whatever)?
I though Exchange server is already an SMTP server....

Any idea ?

Thanks
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Question by:jskfan
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by:uniqueinfotech
uniqueinfotech earned 500 total points
ID: 39657829
Exchange does include SMTP functionality, however it is perfectly possible to set up a standalone SMTP server, either running exchange or other software. Given the fact that this seems to be not a small set up (they have a load balancer) it is entirely possible also that they have multiple SMTP servers.

Another possibility is that some network devices such as printers or NASes these days can include an SMTP server for the purpose of sending/receiving reports.

I would suggest locating the physical location of the SMTP server and detailing what it actually does. Alternatively you can use nmap to attempt to find out remotely what OS the SMTP server is running.
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by:jskfan
ID: 39657979
I am sure it is not Windows OS..
but after describing our topology do you Think our Exchange servers use it to send email through or receive through?? I do not think it does.. but how can I test that email sent or received does not go through that SMTP box ??
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uniqueinfotech earned 500 total points
ID: 39658270
It's hard to tell without more detail about the topology, however if you have access to the exchange server you can see if the SMTP role is installed.

Simplest way to test would be to use the Mailflow Troubleshooter that comes with Exchange, or just unplug the SMTP box from the network and see if mail still sends.
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Author Closing Comment

by:jskfan
ID: 39661221
Thank you
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